If two people post for the same Pokemon type around the same time (within say 10 hours) I'll consider both applicants and pick between them but once I've accepted someone, I'm not going to overturn that if someone "better" comes along, they'll just have to change their pokemon type, which I don't think should be a big issue for players since the story has an emphasis on the Warden compared to its Companion. Either way though, it's probably better to get a sheet up and started sooner, rather than later.